I made the puzzle tower not to long ago, hosted it for a few days, done hosting it, so it's up for download. An explanation of the puzzle tower is simple, it's a tower of puzzles challengers must complete to reach the top, then they get their name on a wall.
Tower 3 is (yes you guessed it) based on the portal gun mod.
It's not anywhere near as good looking as the last two but it is a challenge seemingly impossible for the average Joe's who came.

Download of the .bls is here.
http://captainluigi.googlepages.com/portalPuzzleTower.blsFor you guys, I got rid of all signs and things added to help people pass the few levels, because I'm confident you guys can do it without help.
Use a Mini-game to start, no-jet, no damage, no starting items as the settings.